2 Copyright (c) 2013-2014 Intel Corp.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License version 2 and
6 only version 2 as published by the Free Software Foundation.
8 This program is distributed in the hope that it will be useful,
9 but WITHOUT ANY WARRANTY; without even the implied warranty of
10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 GNU General Public License for more details.
14 #include <linux/if_arp.h>
15 #include <linux/netdevice.h>
16 #include <linux/etherdevice.h>
17 #include <linux/module.h>
18 #include <linux/debugfs.h>
21 #include <net/ip6_route.h>
22 #include <net/addrconf.h>
23 #include <net/pkt_sched.h>
25 #include <net/bluetooth/bluetooth.h>
26 #include <net/bluetooth/hci_core.h>
27 #include <net/bluetooth/l2cap.h>
29 #include <net/6lowpan.h> /* for the compression support */
33 static struct dentry *lowpan_enable_debugfs;
34 static struct dentry *lowpan_control_debugfs;
36 #define IFACE_NAME_TEMPLATE "bt%d"
41 struct l2cap_chan *chan;
43 #define lowpan_cb(skb) ((struct skb_cb *)((skb)->cb))
45 /* The devices list contains those devices that we are acting
46 * as a proxy. The BT 6LoWPAN device is a virtual device that
47 * connects to the Bluetooth LE device. The real connection to
48 * BT device is done via l2cap layer. There exists one
49 * virtual device / one BT 6LoWPAN network (=hciX device).
50 * The list contains struct lowpan_dev elements.
52 static LIST_HEAD(bt_6lowpan_devices);
53 static DEFINE_SPINLOCK(devices_lock);
55 static bool enable_6lowpan;
57 /* We are listening incoming connections via this channel
59 static struct l2cap_chan *listen_chan;
62 struct list_head list;
64 struct l2cap_chan *chan;
66 /* peer addresses in various formats */
67 unsigned char lladdr[ETH_ALEN];
68 struct in6_addr peer_addr;
71 struct lowpan_btle_dev {
72 struct list_head list;
75 struct net_device *netdev;
76 struct list_head peers;
77 atomic_t peer_count; /* number of items in peers list */
79 struct work_struct delete_netdev;
80 struct delayed_work notify_peers;
83 static inline struct lowpan_btle_dev *
84 lowpan_btle_dev(const struct net_device *netdev)
86 return (struct lowpan_btle_dev *)lowpan_dev(netdev)->priv;
89 static inline void peer_add(struct lowpan_btle_dev *dev,
90 struct lowpan_peer *peer)
92 list_add_rcu(&peer->list, &dev->peers);
93 atomic_inc(&dev->peer_count);
96 static inline bool peer_del(struct lowpan_btle_dev *dev,
97 struct lowpan_peer *peer)
99 list_del_rcu(&peer->list);
100 kfree_rcu(peer, rcu);
102 module_put(THIS_MODULE);
104 if (atomic_dec_and_test(&dev->peer_count)) {
112 static inline struct lowpan_peer *peer_lookup_ba(struct lowpan_btle_dev *dev,
113 bdaddr_t *ba, __u8 type)
115 struct lowpan_peer *peer;
117 BT_DBG("peers %d addr %pMR type %d", atomic_read(&dev->peer_count),
122 list_for_each_entry_rcu(peer, &dev->peers, list) {
123 BT_DBG("dst addr %pMR dst type %d",
124 &peer->chan->dst, peer->chan->dst_type);
126 if (bacmp(&peer->chan->dst, ba))
129 if (type == peer->chan->dst_type) {
140 static inline struct lowpan_peer *
141 __peer_lookup_chan(struct lowpan_btle_dev *dev, struct l2cap_chan *chan)
143 struct lowpan_peer *peer;
145 list_for_each_entry_rcu(peer, &dev->peers, list) {
146 if (peer->chan == chan)
153 static inline struct lowpan_peer *
154 __peer_lookup_conn(struct lowpan_btle_dev *dev, struct l2cap_conn *conn)
156 struct lowpan_peer *peer;
158 list_for_each_entry_rcu(peer, &dev->peers, list) {
159 if (peer->chan->conn == conn)
166 static inline struct lowpan_peer *peer_lookup_dst(struct lowpan_btle_dev *dev,
167 struct in6_addr *daddr,
170 struct lowpan_peer *peer;
171 struct in6_addr *nexthop;
172 struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
173 int count = atomic_read(&dev->peer_count);
175 BT_DBG("peers %d addr %pI6c rt %p", count, daddr, rt);
177 /* If we have multiple 6lowpan peers, then check where we should
178 * send the packet. If only one peer exists, then we can send the
183 peer = list_first_or_null_rcu(&dev->peers, struct lowpan_peer,
190 nexthop = &lowpan_cb(skb)->gw;
192 if (ipv6_addr_any(nexthop))
195 nexthop = rt6_nexthop(rt, daddr);
197 /* We need to remember the address because it is needed
198 * by bt_xmit() when sending the packet. In bt_xmit(), the
199 * destination routing info is not set.
201 memcpy(&lowpan_cb(skb)->gw, nexthop, sizeof(struct in6_addr));
204 BT_DBG("gw %pI6c", nexthop);
208 list_for_each_entry_rcu(peer, &dev->peers, list) {
209 BT_DBG("dst addr %pMR dst type %d ip %pI6c",
210 &peer->chan->dst, peer->chan->dst_type,
213 if (!ipv6_addr_cmp(&peer->peer_addr, nexthop)) {
224 static struct lowpan_peer *lookup_peer(struct l2cap_conn *conn)
226 struct lowpan_btle_dev *entry;
227 struct lowpan_peer *peer = NULL;
231 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
232 peer = __peer_lookup_conn(entry, conn);
242 static struct lowpan_btle_dev *lookup_dev(struct l2cap_conn *conn)
244 struct lowpan_btle_dev *entry;
245 struct lowpan_btle_dev *dev = NULL;
249 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
250 if (conn->hcon->hdev == entry->hdev) {
261 static int give_skb_to_upper(struct sk_buff *skb, struct net_device *dev)
263 struct sk_buff *skb_cp;
265 skb_cp = skb_copy(skb, GFP_ATOMIC);
269 return netif_rx_ni(skb_cp);
272 static int iphc_decompress(struct sk_buff *skb, struct net_device *netdev,
273 struct lowpan_peer *peer)
277 saddr = peer->lladdr;
279 return lowpan_header_decompress(skb, netdev, netdev->dev_addr, saddr);
282 static int recv_pkt(struct sk_buff *skb, struct net_device *dev,
283 struct lowpan_peer *peer)
285 struct sk_buff *local_skb;
288 if (!netif_running(dev))
291 if (dev->type != ARPHRD_6LOWPAN || !skb->len)
294 skb_reset_network_header(skb);
296 skb = skb_share_check(skb, GFP_ATOMIC);
300 /* check that it's our buffer */
301 if (lowpan_is_ipv6(*skb_network_header(skb))) {
302 /* Pull off the 1-byte of 6lowpan header. */
305 /* Copy the packet so that the IPv6 header is
308 local_skb = skb_copy_expand(skb, NET_SKB_PAD - 1,
309 skb_tailroom(skb), GFP_ATOMIC);
313 local_skb->protocol = htons(ETH_P_IPV6);
314 local_skb->pkt_type = PACKET_HOST;
315 local_skb->dev = dev;
317 skb_set_transport_header(local_skb, sizeof(struct ipv6hdr));
319 if (give_skb_to_upper(local_skb, dev) != NET_RX_SUCCESS) {
320 kfree_skb(local_skb);
324 dev->stats.rx_bytes += skb->len;
325 dev->stats.rx_packets++;
327 consume_skb(local_skb);
329 } else if (lowpan_is_iphc(*skb_network_header(skb))) {
330 local_skb = skb_clone(skb, GFP_ATOMIC);
334 local_skb->dev = dev;
336 ret = iphc_decompress(local_skb, dev, peer);
338 BT_DBG("iphc_decompress failed: %d", ret);
339 kfree_skb(local_skb);
343 local_skb->protocol = htons(ETH_P_IPV6);
344 local_skb->pkt_type = PACKET_HOST;
346 if (give_skb_to_upper(local_skb, dev)
348 kfree_skb(local_skb);
352 dev->stats.rx_bytes += skb->len;
353 dev->stats.rx_packets++;
355 consume_skb(local_skb);
358 BT_DBG("unknown packet type");
362 return NET_RX_SUCCESS;
365 dev->stats.rx_dropped++;
369 /* Packet from BT LE device */
370 static int chan_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
372 struct lowpan_btle_dev *dev;
373 struct lowpan_peer *peer;
376 peer = lookup_peer(chan->conn);
380 dev = lookup_dev(chan->conn);
381 if (!dev || !dev->netdev)
384 err = recv_pkt(skb, dev->netdev, peer);
386 BT_DBG("recv pkt %d", err);
393 static int setup_header(struct sk_buff *skb, struct net_device *netdev,
394 bdaddr_t *peer_addr, u8 *peer_addr_type)
396 struct in6_addr ipv6_daddr;
398 struct lowpan_btle_dev *dev;
399 struct lowpan_peer *peer;
405 dev = lowpan_btle_dev(netdev);
407 memcpy(&ipv6_daddr, &hdr->daddr, sizeof(ipv6_daddr));
409 if (ipv6_addr_is_multicast(&ipv6_daddr)) {
410 lowpan_cb(skb)->chan = NULL;
413 BT_DBG("dest IP %pI6c", &ipv6_daddr);
415 /* The packet might be sent to 6lowpan interface
416 * because of routing (either via default route
417 * or user set route) so get peer according to
418 * the destination address.
420 peer = peer_lookup_dst(dev, &ipv6_daddr, skb);
422 BT_DBG("no such peer");
426 daddr = peer->lladdr;
427 *peer_addr = peer->chan->dst;
428 *peer_addr_type = peer->chan->dst_type;
429 lowpan_cb(skb)->chan = peer->chan;
434 lowpan_header_compress(skb, netdev, daddr, dev->netdev->dev_addr);
436 err = dev_hard_header(skb, netdev, ETH_P_IPV6, NULL, NULL, 0);
443 static int header_create(struct sk_buff *skb, struct net_device *netdev,
444 unsigned short type, const void *_daddr,
445 const void *_saddr, unsigned int len)
447 if (type != ETH_P_IPV6)
453 /* Packet to BT LE device */
454 static int send_pkt(struct l2cap_chan *chan, struct sk_buff *skb,
455 struct net_device *netdev)
461 /* Remember the skb so that we can send EAGAIN to the caller if
462 * we run out of credits.
466 iv.iov_base = skb->data;
467 iv.iov_len = skb->len;
469 memset(&msg, 0, sizeof(msg));
470 iov_iter_kvec(&msg.msg_iter, WRITE, &iv, 1, skb->len);
472 err = l2cap_chan_send(chan, &msg, skb->len);
474 netdev->stats.tx_bytes += err;
475 netdev->stats.tx_packets++;
480 netdev->stats.tx_errors++;
485 static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev)
487 struct sk_buff *local_skb;
488 struct lowpan_btle_dev *entry;
493 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
494 struct lowpan_peer *pentry;
495 struct lowpan_btle_dev *dev;
497 if (entry->netdev != netdev)
500 dev = lowpan_btle_dev(entry->netdev);
502 list_for_each_entry_rcu(pentry, &dev->peers, list) {
505 local_skb = skb_clone(skb, GFP_ATOMIC);
507 BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
509 &pentry->chan->dst, pentry->chan->dst_type,
510 &pentry->peer_addr, pentry->chan);
511 ret = send_pkt(pentry->chan, local_skb, netdev);
515 kfree_skb(local_skb);
524 static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev)
530 /* We must take a copy of the skb before we modify/replace the ipv6
531 * header as the header could be used elsewhere
533 skb = skb_unshare(skb, GFP_ATOMIC);
535 return NET_XMIT_DROP;
537 /* Return values from setup_header()
538 * <0 - error, packet is dropped
539 * 0 - this is a multicast packet
540 * 1 - this is unicast packet
542 err = setup_header(skb, netdev, &addr, &addr_type);
545 return NET_XMIT_DROP;
549 if (lowpan_cb(skb)->chan) {
550 BT_DBG("xmit %s to %pMR type %d IP %pI6c chan %p",
551 netdev->name, &addr, addr_type,
552 &lowpan_cb(skb)->addr, lowpan_cb(skb)->chan);
553 err = send_pkt(lowpan_cb(skb)->chan, skb, netdev);
558 /* We need to send the packet to every device behind this
561 err = send_mcast_pkt(skb, netdev);
567 BT_DBG("ERROR: xmit failed (%d)", err);
569 return err < 0 ? NET_XMIT_DROP : err;
572 static int bt_dev_init(struct net_device *dev)
574 netdev_lockdep_set_classes(dev);
579 static const struct net_device_ops netdev_ops = {
580 .ndo_init = bt_dev_init,
581 .ndo_start_xmit = bt_xmit,
584 static struct header_ops header_ops = {
585 .create = header_create,
588 static void netdev_setup(struct net_device *dev)
590 dev->hard_header_len = 0;
591 dev->needed_tailroom = 0;
592 dev->flags = IFF_RUNNING | IFF_MULTICAST;
593 dev->watchdog_timeo = 0;
594 dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN;
596 dev->netdev_ops = &netdev_ops;
597 dev->header_ops = &header_ops;
598 dev->needs_free_netdev = true;
601 static struct device_type bt_type = {
605 static void ifup(struct net_device *netdev)
610 err = dev_open(netdev);
612 BT_INFO("iface %s cannot be opened (%d)", netdev->name, err);
616 static void ifdown(struct net_device *netdev)
623 static void do_notify_peers(struct work_struct *work)
625 struct lowpan_btle_dev *dev = container_of(work, struct lowpan_btle_dev,
628 netdev_notify_peers(dev->netdev); /* send neighbour adv at startup */
631 static bool is_bt_6lowpan(struct hci_conn *hcon)
633 if (hcon->type != LE_LINK)
642 static struct l2cap_chan *chan_create(void)
644 struct l2cap_chan *chan;
646 chan = l2cap_chan_create();
650 l2cap_chan_set_defaults(chan);
652 chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
653 chan->mode = L2CAP_MODE_LE_FLOWCTL;
659 static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan,
660 struct lowpan_btle_dev *dev,
663 struct lowpan_peer *peer;
665 peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
670 memset(&peer->peer_addr, 0, sizeof(struct in6_addr));
672 baswap((void *)peer->lladdr, &chan->dst);
674 lowpan_iphc_uncompress_eui48_lladdr(&peer->peer_addr, peer->lladdr);
676 spin_lock(&devices_lock);
677 INIT_LIST_HEAD(&peer->list);
679 spin_unlock(&devices_lock);
681 /* Notifying peers about us needs to be done without locks held */
683 INIT_DELAYED_WORK(&dev->notify_peers, do_notify_peers);
684 schedule_delayed_work(&dev->notify_peers, msecs_to_jiffies(100));
689 static int setup_netdev(struct l2cap_chan *chan, struct lowpan_btle_dev **dev)
691 struct net_device *netdev;
694 netdev = alloc_netdev(LOWPAN_PRIV_SIZE(sizeof(struct lowpan_btle_dev)),
695 IFACE_NAME_TEMPLATE, NET_NAME_UNKNOWN,
700 netdev->addr_assign_type = NET_ADDR_PERM;
701 baswap((void *)netdev->dev_addr, &chan->src);
703 netdev->netdev_ops = &netdev_ops;
704 SET_NETDEV_DEV(netdev, &chan->conn->hcon->hdev->dev);
705 SET_NETDEV_DEVTYPE(netdev, &bt_type);
707 *dev = lowpan_btle_dev(netdev);
708 (*dev)->netdev = netdev;
709 (*dev)->hdev = chan->conn->hcon->hdev;
710 INIT_LIST_HEAD(&(*dev)->peers);
712 spin_lock(&devices_lock);
713 INIT_LIST_HEAD(&(*dev)->list);
714 list_add_rcu(&(*dev)->list, &bt_6lowpan_devices);
715 spin_unlock(&devices_lock);
717 err = lowpan_register_netdev(netdev, LOWPAN_LLTYPE_BTLE);
719 BT_INFO("register_netdev failed %d", err);
720 spin_lock(&devices_lock);
721 list_del_rcu(&(*dev)->list);
722 spin_unlock(&devices_lock);
727 BT_DBG("ifindex %d peer bdaddr %pMR type %d my addr %pMR type %d",
728 netdev->ifindex, &chan->dst, chan->dst_type,
729 &chan->src, chan->src_type);
730 set_bit(__LINK_STATE_PRESENT, &netdev->state);
738 static inline void chan_ready_cb(struct l2cap_chan *chan)
740 struct lowpan_btle_dev *dev;
741 bool new_netdev = false;
743 dev = lookup_dev(chan->conn);
745 BT_DBG("chan %p conn %p dev %p", chan, chan->conn, dev);
748 if (setup_netdev(chan, &dev) < 0) {
749 l2cap_chan_del(chan, -ENOENT);
755 if (!try_module_get(THIS_MODULE))
758 add_peer_chan(chan, dev, new_netdev);
762 static inline struct l2cap_chan *chan_new_conn_cb(struct l2cap_chan *pchan)
764 struct l2cap_chan *chan;
766 chan = chan_create();
770 chan->ops = pchan->ops;
772 BT_DBG("chan %p pchan %p", chan, pchan);
777 static void delete_netdev(struct work_struct *work)
779 struct lowpan_btle_dev *entry = container_of(work,
780 struct lowpan_btle_dev,
783 lowpan_unregister_netdev(entry->netdev);
785 /* The entry pointer is deleted by the netdev destructor. */
788 static void chan_close_cb(struct l2cap_chan *chan)
790 struct lowpan_btle_dev *entry;
791 struct lowpan_btle_dev *dev = NULL;
792 struct lowpan_peer *peer;
794 bool last = false, remove = true;
796 BT_DBG("chan %p conn %p", chan, chan->conn);
798 if (chan->conn && chan->conn->hcon) {
799 if (!is_bt_6lowpan(chan->conn->hcon))
802 /* If conn is set, then the netdev is also there and we should
808 spin_lock(&devices_lock);
810 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
811 dev = lowpan_btle_dev(entry->netdev);
812 peer = __peer_lookup_chan(dev, chan);
814 last = peer_del(dev, peer);
817 BT_DBG("dev %p removing %speer %p", dev,
818 last ? "last " : "1 ", peer);
819 BT_DBG("chan %p orig refcnt %d", chan,
820 kref_read(&chan->kref));
822 l2cap_chan_put(chan);
827 if (!err && last && dev && !atomic_read(&dev->peer_count)) {
828 spin_unlock(&devices_lock);
830 cancel_delayed_work_sync(&dev->notify_peers);
835 INIT_WORK(&entry->delete_netdev, delete_netdev);
836 schedule_work(&entry->delete_netdev);
839 spin_unlock(&devices_lock);
845 static void chan_state_change_cb(struct l2cap_chan *chan, int state, int err)
847 BT_DBG("chan %p conn %p state %s err %d", chan, chan->conn,
848 state_to_string(state), err);
851 static struct sk_buff *chan_alloc_skb_cb(struct l2cap_chan *chan,
852 unsigned long hdr_len,
853 unsigned long len, int nb)
855 /* Note that we must allocate using GFP_ATOMIC here as
856 * this function is called originally from netdev hard xmit
857 * function in atomic context.
859 return bt_skb_alloc(hdr_len + len, GFP_ATOMIC);
862 static void chan_suspend_cb(struct l2cap_chan *chan)
864 struct lowpan_btle_dev *dev;
866 BT_DBG("chan %p suspend", chan);
868 dev = lookup_dev(chan->conn);
869 if (!dev || !dev->netdev)
872 netif_stop_queue(dev->netdev);
875 static void chan_resume_cb(struct l2cap_chan *chan)
877 struct lowpan_btle_dev *dev;
879 BT_DBG("chan %p resume", chan);
881 dev = lookup_dev(chan->conn);
882 if (!dev || !dev->netdev)
885 netif_wake_queue(dev->netdev);
888 static long chan_get_sndtimeo_cb(struct l2cap_chan *chan)
890 return L2CAP_CONN_TIMEOUT;
893 static const struct l2cap_ops bt_6lowpan_chan_ops = {
894 .name = "L2CAP 6LoWPAN channel",
895 .new_connection = chan_new_conn_cb,
896 .recv = chan_recv_cb,
897 .close = chan_close_cb,
898 .state_change = chan_state_change_cb,
899 .ready = chan_ready_cb,
900 .resume = chan_resume_cb,
901 .suspend = chan_suspend_cb,
902 .get_sndtimeo = chan_get_sndtimeo_cb,
903 .alloc_skb = chan_alloc_skb_cb,
905 .teardown = l2cap_chan_no_teardown,
906 .defer = l2cap_chan_no_defer,
907 .set_shutdown = l2cap_chan_no_set_shutdown,
910 static inline __u8 bdaddr_type(__u8 type)
912 if (type == ADDR_LE_DEV_PUBLIC)
913 return BDADDR_LE_PUBLIC;
915 return BDADDR_LE_RANDOM;
918 static int bt_6lowpan_connect(bdaddr_t *addr, u8 dst_type)
920 struct l2cap_chan *chan;
923 chan = chan_create();
927 chan->ops = &bt_6lowpan_chan_ops;
929 err = l2cap_chan_connect(chan, cpu_to_le16(L2CAP_PSM_IPSP), 0,
932 BT_DBG("chan %p err %d", chan, err);
934 l2cap_chan_put(chan);
939 static int bt_6lowpan_disconnect(struct l2cap_conn *conn, u8 dst_type)
941 struct lowpan_peer *peer;
943 BT_DBG("conn %p dst type %d", conn, dst_type);
945 peer = lookup_peer(conn);
949 BT_DBG("peer %p chan %p", peer, peer->chan);
951 l2cap_chan_close(peer->chan, ENOENT);
956 static struct l2cap_chan *bt_6lowpan_listen(void)
958 bdaddr_t *addr = BDADDR_ANY;
959 struct l2cap_chan *chan;
965 chan = chan_create();
969 chan->ops = &bt_6lowpan_chan_ops;
970 chan->state = BT_LISTEN;
971 chan->src_type = BDADDR_LE_PUBLIC;
973 atomic_set(&chan->nesting, L2CAP_NESTING_PARENT);
975 BT_DBG("chan %p src type %d", chan, chan->src_type);
977 err = l2cap_add_psm(chan, addr, cpu_to_le16(L2CAP_PSM_IPSP));
979 l2cap_chan_put(chan);
980 BT_ERR("psm cannot be added err %d", err);
987 static int get_l2cap_conn(char *buf, bdaddr_t *addr, u8 *addr_type,
988 struct l2cap_conn **conn)
990 struct hci_conn *hcon;
991 struct hci_dev *hdev;
994 n = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx %hhu",
995 &addr->b[5], &addr->b[4], &addr->b[3],
996 &addr->b[2], &addr->b[1], &addr->b[0],
1002 /* The LE_PUBLIC address type is ignored because of BDADDR_ANY */
1003 hdev = hci_get_route(addr, BDADDR_ANY, BDADDR_LE_PUBLIC);
1008 hcon = hci_conn_hash_lookup_le(hdev, addr, *addr_type);
1009 hci_dev_unlock(hdev);
1014 *conn = (struct l2cap_conn *)hcon->l2cap_data;
1016 BT_DBG("conn %p dst %pMR type %d", *conn, &hcon->dst, hcon->dst_type);
1021 static void disconnect_all_peers(void)
1023 struct lowpan_btle_dev *entry;
1024 struct lowpan_peer *peer, *tmp_peer, *new_peer;
1025 struct list_head peers;
1027 INIT_LIST_HEAD(&peers);
1029 /* We make a separate list of peers as the close_cb() will
1030 * modify the device peers list so it is better not to mess
1031 * with the same list at the same time.
1036 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
1037 list_for_each_entry_rcu(peer, &entry->peers, list) {
1038 new_peer = kmalloc(sizeof(*new_peer), GFP_ATOMIC);
1042 new_peer->chan = peer->chan;
1043 INIT_LIST_HEAD(&new_peer->list);
1045 list_add(&new_peer->list, &peers);
1051 spin_lock(&devices_lock);
1052 list_for_each_entry_safe(peer, tmp_peer, &peers, list) {
1053 l2cap_chan_close(peer->chan, ENOENT);
1055 list_del_rcu(&peer->list);
1056 kfree_rcu(peer, rcu);
1058 spin_unlock(&devices_lock);
1062 struct work_struct work;
1066 static void do_enable_set(struct work_struct *work)
1068 struct set_enable *set_enable = container_of(work,
1069 struct set_enable, work);
1071 if (!set_enable->flag || enable_6lowpan != set_enable->flag)
1072 /* Disconnect existing connections if 6lowpan is
1075 disconnect_all_peers();
1077 enable_6lowpan = set_enable->flag;
1080 l2cap_chan_close(listen_chan, 0);
1081 l2cap_chan_put(listen_chan);
1084 listen_chan = bt_6lowpan_listen();
1089 static int lowpan_enable_set(void *data, u64 val)
1091 struct set_enable *set_enable;
1093 set_enable = kzalloc(sizeof(*set_enable), GFP_KERNEL);
1097 set_enable->flag = !!val;
1098 INIT_WORK(&set_enable->work, do_enable_set);
1100 schedule_work(&set_enable->work);
1105 static int lowpan_enable_get(void *data, u64 *val)
1107 *val = enable_6lowpan;
1111 DEFINE_SIMPLE_ATTRIBUTE(lowpan_enable_fops, lowpan_enable_get,
1112 lowpan_enable_set, "%llu\n");
1114 static ssize_t lowpan_control_write(struct file *fp,
1115 const char __user *user_buffer,
1120 size_t buf_size = min(count, sizeof(buf) - 1);
1124 struct l2cap_conn *conn = NULL;
1126 if (copy_from_user(buf, user_buffer, buf_size))
1129 buf[buf_size] = '\0';
1131 if (memcmp(buf, "connect ", 8) == 0) {
1132 ret = get_l2cap_conn(&buf[8], &addr, &addr_type, &conn);
1137 l2cap_chan_close(listen_chan, 0);
1138 l2cap_chan_put(listen_chan);
1143 struct lowpan_peer *peer;
1145 if (!is_bt_6lowpan(conn->hcon))
1148 peer = lookup_peer(conn);
1150 BT_DBG("6LoWPAN connection already exists");
1154 BT_DBG("conn %p dst %pMR type %d user %d", conn,
1155 &conn->hcon->dst, conn->hcon->dst_type,
1159 ret = bt_6lowpan_connect(&addr, addr_type);
1166 if (memcmp(buf, "disconnect ", 11) == 0) {
1167 ret = get_l2cap_conn(&buf[11], &addr, &addr_type, &conn);
1171 ret = bt_6lowpan_disconnect(conn, addr_type);
1181 static int lowpan_control_show(struct seq_file *f, void *ptr)
1183 struct lowpan_btle_dev *entry;
1184 struct lowpan_peer *peer;
1186 spin_lock(&devices_lock);
1188 list_for_each_entry(entry, &bt_6lowpan_devices, list) {
1189 list_for_each_entry(peer, &entry->peers, list)
1190 seq_printf(f, "%pMR (type %u)\n",
1191 &peer->chan->dst, peer->chan->dst_type);
1194 spin_unlock(&devices_lock);
1199 static int lowpan_control_open(struct inode *inode, struct file *file)
1201 return single_open(file, lowpan_control_show, inode->i_private);
1204 static const struct file_operations lowpan_control_fops = {
1205 .open = lowpan_control_open,
1207 .write = lowpan_control_write,
1208 .llseek = seq_lseek,
1209 .release = single_release,
1212 static void disconnect_devices(void)
1214 struct lowpan_btle_dev *entry, *tmp, *new_dev;
1215 struct list_head devices;
1217 INIT_LIST_HEAD(&devices);
1219 /* We make a separate list of devices because the unregister_netdev()
1220 * will call device_event() which will also want to modify the same
1226 list_for_each_entry_rcu(entry, &bt_6lowpan_devices, list) {
1227 new_dev = kmalloc(sizeof(*new_dev), GFP_ATOMIC);
1231 new_dev->netdev = entry->netdev;
1232 INIT_LIST_HEAD(&new_dev->list);
1234 list_add_rcu(&new_dev->list, &devices);
1239 list_for_each_entry_safe(entry, tmp, &devices, list) {
1240 ifdown(entry->netdev);
1241 BT_DBG("Unregistering netdev %s %p",
1242 entry->netdev->name, entry->netdev);
1243 lowpan_unregister_netdev(entry->netdev);
1248 static int device_event(struct notifier_block *unused,
1249 unsigned long event, void *ptr)
1251 struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
1252 struct lowpan_btle_dev *entry;
1254 if (netdev->type != ARPHRD_6LOWPAN)
1258 case NETDEV_UNREGISTER:
1259 spin_lock(&devices_lock);
1260 list_for_each_entry(entry, &bt_6lowpan_devices, list) {
1261 if (entry->netdev == netdev) {
1262 BT_DBG("Unregistered netdev %s %p",
1263 netdev->name, netdev);
1264 list_del(&entry->list);
1268 spin_unlock(&devices_lock);
1275 static struct notifier_block bt_6lowpan_dev_notifier = {
1276 .notifier_call = device_event,
1279 static int __init bt_6lowpan_init(void)
1281 lowpan_enable_debugfs = debugfs_create_file("6lowpan_enable", 0644,
1283 &lowpan_enable_fops);
1284 lowpan_control_debugfs = debugfs_create_file("6lowpan_control", 0644,
1286 &lowpan_control_fops);
1288 return register_netdevice_notifier(&bt_6lowpan_dev_notifier);
1291 static void __exit bt_6lowpan_exit(void)
1293 debugfs_remove(lowpan_enable_debugfs);
1294 debugfs_remove(lowpan_control_debugfs);
1297 l2cap_chan_close(listen_chan, 0);
1298 l2cap_chan_put(listen_chan);
1301 disconnect_devices();
1303 unregister_netdevice_notifier(&bt_6lowpan_dev_notifier);
1306 module_init(bt_6lowpan_init);
1307 module_exit(bt_6lowpan_exit);
1309 MODULE_AUTHOR("Jukka Rissanen <jukka.rissanen@linux.intel.com>");
1310 MODULE_DESCRIPTION("Bluetooth 6LoWPAN");
1311 MODULE_VERSION(VERSION);
1312 MODULE_LICENSE("GPL");